EZjumper

Just purchased Bianchi Pisata track bike to ride on the road. To save a dollar the mechanic at the shop I got the bike from took my 1 year old single sided wellgoMG-8 Road Pedals (clipless) off my old bike and sliped them onto the Bianchi. My first day out after about an hour of I noticed the drive side, right side pedal was coming unscrewed. I screwed it back on with my portable allen key set, and when I got home really cranked it on with my 6 mm hex wrench. Today after another 45 minutes of riding, and me stupidly not paying attention, the pedal came right off, taking the first thread in the crank with it. I got it back on again, and took it to a near by bike shop. The mechanic cranked it back on, and told it wouldn't come off again. It has...
My question here, is before I go out and buy a new pedal system, are there any other options I can attempt first, or should I just bite the bullet and get a new set of pedals before I have to add a new crank to the list?

Thank's in advance for any help!
-g

Sir Lunch-a-lot

I recall when my dad was putting together piping for plumbing, he wrapped the thread with some kind of white stuff to seal it. Potentially, wrapping the threads of your pedal with something like this (or maybe something else... string or thread of some sort maybe?) might fix it. I don't know for sure, as I have never tried it. Wait and see what others here have to say on the issue.

EDIT: Another thought: if I am not mistaken, right side and left side pedals have the thread going in the opposite direction. Do you maybe have the wrong pedal on your crank?

bkaapcke

You hane a steel pedal axle going into aluminum. Loctite might hold it, but, who knows if you could get it out again in a few years. Anti-sieze is what belongs in there. I'd get new pedals, and run a tap through the holes to clean up the threads. bk

EZjumper

Thank you both for your replies.

I think instead of locking on the pedals for the rest my life, I will just invest in a new pair.

btw... when one say's "...run a tap through the holes to clean up the threads." do they mean the tap on my sink? I'm kind of slow today...

Thank you!!

-G

vpiuva

A tap is used to clean up your threads. It looks a lot like a screw with 4 slots down the sides. Your LBS could do it cheap if you're not into buying tools.

EZjumper

Allways into buying tools. Thank you everyone for you help. I'm off shopping.

robo

It's really kind of strange, as the threading on pedals is designed so that they 'self tighten' as you pedal. Are the bearings on that pedal seized up or really, really stiff?

Bill Kapaun

I can't imagine a "mechanic" tightening a pedal and have it loose.
Even if the bearings were frozen, the pedal shouldn't come off. Just not enough leverage fron 1/2 the width of a pedal..

I've never understood "self tightening". Maybe if you pedaled backwards!

robo

It's not hard if you think about it for a moment. Your weight and the rotation of the cranks means that the place the the pedal axle is 'flexed' rotates around the axle once for each crank rotation.

If you curl your hand up around the index finger of your other hand, hold that finger rigid, and try to flex it around in a circle, you'll find that it wants to 'roll' in the direction opposite to the rotation of the stress.

That's why pedals are threaded that way. The torque caused by the drag of the pedal bearings is tiny compared to this torque, unless the bearings are completely locked up.

I agree that it's strange that the pedals are coming out even after they were tightened by two mechanics.. i really can't think of an explanation.

soloban

It'd called pift (sp?) tape. I don't really like it would solve the problem. My vote is that the Pedal is FUBAR.

robo

You probably mean PTFE, which is short for Polytetrafluoroethylene, which is long for Teflon

greyghost_6

I would try just putting the pedal on dry, no grease or anything. Give it a good crank of the allen or 15mm and see what happens. I had a guy that kept comming back into our shop about his drive side pedal. It seemed to fix the problem.

soloban

Isn't that the 2nd ingredient in Diet Cola?

Wogster